$sin^2\theta\:\:csc\theta\:\:sec\theta\:$
$\frac{x^2}{4}-9y^2$
$\csc-\cot\left(y\right)=\frac{\sec\left(y\right)}{1+\cos\left(y\right)}$
$\frac{dy}{dx}=\frac{x^3}{y^4}$
$\:2ab+4a,\:a=3,\:b=1$
$9b^2-25y^2$
$\left(1+\frac{1}{2}d^4\right)^2$
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